[Jim Robertson]

Starting a thread for all things Pontiac 350. Post up your dyno numbers, track performance numbers and engine combinations. Judgment Free thread.

[taff2]

I used one years back in a turbo combo project, detonation re-positioned most of the ring lands into the oil pan.
I believe it could make for a very good high boost lower (7000) rpm turbo combo, if used with splayed caps,dry decked etc etc. It's still an over square engine despite it's small bore - just look at what the iron 5.3 LS truck blocks are achieving with an inferior deck/small diameter studs. I sonic checked an early 350 a while back, bore walls were around .200" IIRC, and the mains bulkheads were pretty thick too. The block certainly weighed more than a couple of 400 blocks I had.

[455dan]

Bruce Fulper built a real potent 350 -several years back,

Can''t remember which mag it was a featured build in.

maybe someone else has a link


IIRC 540 HP on pump gas
\

[AIR RAM]

Originally Posted by 455dan

Bruce Fulper built a real potent 350 -several years back,

Can''t remember which mag it was a featured build in.

maybe someone else has a link


IIRC 540 HP on pump gas
\

Yes he sure did... He copied much of my build!

AFTER I purchased all my parts from R&RE and built my 350 at the Auto Hobby in Aviano Italy. Back then the internet was not what it is today and I purchased all my parts from R&RE while stationed overseas. Spent lots of time on the phone with Bruce talking about the build and spent lots of money with him as well. So he knew exactly what I did to my P350 and he seemed to like it so much he decided to build a similar 350 himself.

I do believe I was one of the first if not the only people to shoe horn a set of 72cc EDL RPM round Ports to a P350 Firebird back in 1997ish...

My engine was .040 bore with 10.75:1cr and ran great on pump gas. I dont recall the cam specs however I still have it, Ill go take a look and see if it has any numbers on it.

over 10 years later I learn that Bruce built and published an article (well after my 350 build) on a similar combination... I kind of expected to read some form of credit given towards my build... but no credit given.

Anyway, the car ran a 13.5 @ 108* <--- Trap speed was good for 12.5x potential but that was with a 10 bolt peg leg (one wheel wonder) . It basically spun one tire all of first and most of 2nd. With traction it would have ran high to mid 11's, I later on added a 4.10 rear gear and an Auburn posi and 6pt roll bars however never got back to the track with that combination. If I had to guess I would say it put down just over 400RWHP and 480ish crank.

Anyway, if I where building a P350 today, I would use the EDL RPM heads out of the box, do a .060+ bore and add a forged crank and run 10-15lbs boost.

SPEED SAFE, NICK

[455dan]

Originally Posted by AIR RAM

Yes he sure did... He copied much of my build!

AFTER I purchased all my parts from R&RE and built my 350 at the Auto Hobby in Aviano Italy. Back then the internet was not what it is today and I purchased all my parts from R&RE while stationed overseas. Spent lots of time on the phone with Bruce talking about the build and spent lots of money with him as well. So he knew exactly what I did to my P350 and he seemed to like it so much he decided to build a similar 350 himself.

I do believe I was one of the first if not the only people to shoe horn a set of 72cc EDL RPM round Ports to a P350 Firebird back in 1997ish...

My engine was .040 bore with 10.75:1cr and ran great on pump gas. I dont recall the cam specs however I still have it, Ill go take a look and see if it has any numbers on it.

over 10 years later I learn that Bruce built and published an article (well after my 350 build) on a similar combination... I kind of expected to read some form of credit given towards my build... but no credit given.

Anyway, the car ran a 13.5 @ 108* <--- Trap speed was good for 12.5x potential with a 10 bolt peg leg. It basically spun all of first and most of 2nd. With traction it would have ran high to mid 11's, I later on added a 4.10 rear gear and an Auburn posi and 6pt roll bars however never got back to the track with that combination.

Anyway, if I where building a P350 today, I would use the EDL RPM heads out of the box, add a forged crank and run boost.

SPEED SAFE, NICK

Wow - learn something new every day.

So your engine was the catalyst for the build.

I just remember reading the article and being kind of blown away by the HP the pump gas 350 produced for its time. Seems like the writer was so surprised that they Tore the engine down because they did not believe it was really just a 350 cube engine.
Yeah I don't remember any credit given for the 1st iteration or builder, just Bruce RRE.

My hat is off to you Sir.

It would be great to have your complete build listed, Kind of a "Broke the mold" engine.

heck I have couple P 350's sitting , maybe someday with the right project car.

[ponyakr]

Can't talk about Pontiac 350 engines, in the race section, without mentioning all the quick national record holding '74 Venturas that have run, thru the years. They've won big races & got class wins at Indy.

Bill Rink ran quick in Stock, & is still quick with his '74 GTO, in SS.

Also been some quick '77 Birds running a 350, in Stock & SS. Mike Morgan still runs one in a '77 SS Formy. He's won class at Indy & has been R/U to Bill Rink several times.

Member Adam Strang ran some 10.80's with his 350HO powered '68 Bird Stocker.

My Pontiac friend, who is also a member here, won quite a few dirt races with a Pontiac 350.

[455Grandville]

Originally Posted by AIR RAM

Yes he sure did... He copied much of my build!

AFTER I purchased all my parts from R&RE and built my 350 at the Auto Hobby in Aviano Italy. Back then the internet was not what it is today and I purchased all my parts from R&RE while stationed overseas. Spent lots of time on the phone with Bruce talking about the build and spent lots of money with him as well. So he knew exactly what I did to my P350 and he seemed to like it so much he decided to build a similar 350 himself.

I do believe I was one of the first if not the only people to shoe horn a set of 72cc EDL RPM round Ports to a P350 Firebird back in 1997ish...

My engine was .040 bore with 10.75:1cr and ran great on pump gas. I dont recall the cam specs however I still have it, Ill go take a look and see if it has any numbers on it.

over 10 years later I learn that Bruce built and published an article (well after my 350 build) on a similar combination... I kind of expected to read some form of credit given towards my build... but no credit given.

Anyway, the car ran a 13.5 @ 108* <--- Trap speed was good for 12.5x potential but that was with a 10 bolt peg leg (one wheel wonder) . It basically spun one tire all of first and most of 2nd. With traction it would have ran high to mid 11's, I later on added a 4.10 rear gear and an Auburn posi and 6pt roll bars however never got back to the track with that combination. If I had to guess I would say it put down just over 400RWHP and 480ish crank.

Anyway, if I where building a P350 today, I would use the EDL RPM heads out of the box, do a .060+ bore and add a forged crank and run 10-15lbs boost.

SPEED SAFE, NICK

That’s impressive, and that guy sure has a bad rep.

[tom s]

Jim,my 366 std deck build is on this site,V heads.Now stay off here and do my intake!LOLTom

[77 TRASHCAN]

Originally Posted by tom s

Jim,my 366 std deck build is on this site,V heads.Now stay off here and do my intake!LOLTom

Lol.....

[Bill Eveland]

Not going to bring up this guys name , as im not sure if this guy is on here but had a potent 354 build... this was his reply

.455SD rods, light venolia pistons, RAIV 722 heads ported to 310 cfm, ( far easier with aluminum heads we have today) 2.02/1.71 valves, 59cc chambers, pistons .005" out of the hole, stock gm head gaskets because they match the bore, today I'd use a victor intake, instead of the cut and wielded, ported Holley street dominator, 2" to 2 1/8" headers. 1050 dominator on a homemade tapered wood spacer of if a 2x6,( that was 2 tenths over the 800!!!) Cam was a custom backwards grind by UD Harold, 274/267 @.060", lift was .620"/.600" on a 111 LSA. Dual point Borg Warner distributor set up on an old sun machine. Added a second oil feed in the mains,

[PontiacJim1959]

Here is the build for the Royal Pontiac 1969 350HO Firebird that ran in the Super Stack class, SS/J, that pulled an 11.92 1/4 mile time.

The other build is the Fulper specs for the 540HP 350CI magazine article.

Attention must be given to the valve-to-bore clearances when using the larger valve heads and the bore will need to be notched if it does not have them.

[Stan Weiss]

Originally Posted by PontiacJim1959

Here is the build for the Royal Pontiac 1969 350HO Firebird that ran in the Super Stack class, SS/J, that pulled an 11.92 1/4 mile time.

The other build is the Fulper specs for the 540HP 350CI magazine article.

Attention must be given to the valve-to-bore clearances when using the larger valve heads and the bore will need to be notched if it does not have them.

On the Fulper engine do they give cam spec's? Does it say at what RPM it made 540 HP?

Stan

[PontiacJim1959]

Originally Posted by Stan Weiss

On the Fulper engine do they give cam spec's? Does it say at what RPM it made 540 HP?

Stan

No, I don't recall if it had the specs or I would have them - might have been a "Fulper Secret."

There was another article done on the same engine using nitrous, 672HP. The cam specs are listed and may be the same for above.

Comp Cams Solid HR.
Duration at .020" - 285/Int, 296/Ex
Duration at .050" - 255/Int, 260/Ex
1.5 rockers - Lift .538" Int, .538" Ex (these numbers not clear, but under .580")
Lobe Center Angle - 108 degrees
Installed Intake Centerline - 100 degrees

No cam expert, but do the .020" and .050" numbers look true - this is what was shown in the article. Maybe backwards?

More specs on this engine included in the text. Keep in mind, these HP/TQ numbers were not necessarily accepted by others.

[Stan Weiss]

Originally Posted by PontiacJim1959

No, I don't recall if it had the specs or I would have them - might have been a "Fulper Secret."

There was another article done on the same engine using nitrous, 672HP. The cam specs are listed and may be the same for above.

Comp Cams Solid HR.
Duration at .020" - 285/Int, 296/Ex
Duration at .050" - 255/Int, 260/Ex
1.5 rockers - Lift .538" Int, .538" Ex (these numbers not clear, but under .580")
Lobe Center Angle - 108 degrees
Installed Intake Centerline - 100 degrees

No cam expert, but do the .020" and .050" numbers look true - this is what was shown in the article. Maybe backwards?

More specs on this engine included in the text. Keep in mind, these HP/TQ numbers were not necessarily accepted by others.

Jim,
Thanks. Yes for those 0.020" numbers the 0.050" numbers are possible.

Stan

[F/S GTO]

'68 Firebird NHRA Stock Eliminator 350 HO combination. The best it went was 10.80 @123 mph. Minimum weight is 3220 weighed 3300. I was still finding the sweet spot with the clutch that I just had freshened so the 60 ft was off.
.080 over bore,block filled halfway up the coolant holes,stock stroke,Eagle rods and CP pistons. Stock 140 intake and Q-jet carb, .420 lift cam and #18 heads that flow 200 cfm.
Shift at 6200 rpm and cross the finish line at 7k.

Did some updates this past summer the motor is back in the car for next summer,hoping for some 10.60's.

[ponyakr]

"...The best it went was 10.80 @123 mph...weighed 3300...stock stroke, Eagle rods and CP pistons. Stock 140 intake and Q-jet carb, .420 lift cam and #18 heads that flow 200 cfm.
Shift at 6200 rpm and cross the finish line at 7k.

Did some updates...hoping for some 10.60's. "

Now, for all you "experts" that do all sorts of calculations, exactly how much cam & head flow is "supposed" to be needed to make that much power ?

[ponyakr]

The quickest 350 powered '74 Stocker I'm aware of has run some real low 11's. Don't think it's dipped into the 10's, yet.

It's driven by Brad Koivisto. Was a GTO for years. This year, I noticed that it has a flat Ventura hood. Don't know if he got tired of having to deal with the shaker, or if there is a performance advantage, when running without it.

Reminds me of the 1974 US Nats. Al Vanis won Stock, in a Ventura. Rock Running won his class, in a '74 GTO.

[Stan Weiss]

Originally Posted by ponyakr

"...The best it went was 10.80 @123 mph...weighed 3300...stock stroke, Eagle rods and CP pistons. Stock 140 intake and Q-jet carb, .420 lift cam and #18 heads that flow 200 cfm.
Shift at 6200 rpm and cross the finish line at 7k.

Did some updates...hoping for some 10.60's. "

Now, for all you "experts" that do all sorts of calculations, exactly how much cam & head flow is "supposed" to be needed to make that much power ?

There is NO fixed calculation for HP per cfm. Based on the estimated HP on the list he is at 2.5 HP per cfm.

Stan

[POS Racing]

Sorry I got a little behind on this. Dynoed the 350P version 2.0 back in January. It made 584hp/522tq! 10.7 comp on 93 octane.

Got the Ventura finished and to the 1/8mi track over the weekend. Best of [email protected] so far at 3,450lbs through exhaust. Converter is a bit tight and still have s lot of tuning to try. Swapped the PP Crosswind that made the prettiest dyno curve for the Victor that made the highest peak numbers and lost a TENTH! Tuning was limited Sunday as my wife bumped me out of my normal bracket ride so I jumped into competition with the Ventura and went 5 rds🙂

Back to the dual plane and a few other small changes this week then going to Mason Dixon for some 1/4mi fun. Updates soon

[Steve C.]

From post #26- "I don’t know what the specs for the cam where, maybe someone on the forum does. It was a Isky solid roller"

Jay, Not sure if its the same Isky solid roller but back in 2019 you mentioned a Isky solid roller from their 901 series. It was a single pattern with 290/290 advertised.
The .050" duration was 252/252 and ground with a 112 lobe separation.
The lobe lift was 0.3170" and 1.65 rockers . The cam card suggested 0.025" lash.

The grind # was RR-505c62


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