FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#21
|
||||
|
||||
Quote:
Here is a pix of the under hood before I had the v-belts removed and a march pulley system installed. |
#22
|
||||
|
||||
A "massaged" Shaker base to clear Holley fuel bowls and a T2 will fit with a Shaker.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#23
|
||||
|
||||
Had to massage as well on my '70 with a RA IV repro intake to clear the holley street avenger 770.
Last edited by napster; 03-17-2022 at 04:54 PM. |
#24
|
|||
|
|||
Quote:
I did the same thing, and am now in a position that wanting more power means spending more on parts than had I just purchased what was best at the time. Things like rockers don't change in cost across a 1.5 to 1.65 ratio, nor do the springs. But if you decide later on to change these things, you end up paying double, plus your time and labor. At least something to think about. My prediction for power would be in the 520hp/580 ft lbs range. I think the manifolds would work a bit better with a cam on a wider LSA. That said, this combo with an intake and header change down the road would likely pick up a good bit of power, even without a change in valvetrain package.
__________________
-Jason 1969 Pontiac Firebird |
#25
|
||||
|
||||
Is there such a thing as porting and/or polishing exhaust manifolds? Also right now I have a 2 1/4" exhaust system. Looks like a Gardner system but I'm not sure. I'm probably going to put a 2.5" Pypes system on it. Even if I gt headers (which I really don't want to do) I'd still need to upgrade the exhaust.
__________________
70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#26
|
||||
|
||||
Quote:
Here is how my '70 sounds like with the RA IV oversized manifolds and 2.5 inch mandrel bent pipes extensions from Pypes into a Flow Master American Thunder system with mandrel bent 2.5 inch pipes and H-pipe. Finally, Texas TA mufflers. https://youtu.be/AXveB8zehOw https://youtu.be/IsmQXWoIMSU Don't know what sound you are looking for, but it might float your boat. If you want more power, go with the X-pipe for the better scavenging effect. If you want the sound go with H-pipe. I don't race so I go with sound. Last edited by napster; 03-17-2022 at 09:36 PM. |
#27
|
||||
|
||||
The big 455's will absolutely LOVE a 3" head pipe system, X or H and 3" straight thru mufflers. We've moved from 2.5" to 3" on several cars we drive and race here with nice improvements at the track every single time. The "H" is what I use and prefer and it really helps with cancelling out any resonance or "tinny" sounds you often hear with other systems at specific speed/engine RPM's.
At these bigger power levels a set of Ram Air manifolds and 2.5" mandrel bent exhaust with an X or H and straight thru mufflers is the absolute minimum and you are leaving some vehicle performance on the table compared to a good set of headers and larger less restrictive system. Also be aware that moving to a "drop-base" air cleaner after installing a taller intake or spacers can cancel out more power than you ever hoped to make. You need a minimum of 3" from the top of the carb to the bottom of the air cleaner lid or there may be considerable power loss from that modification. I'd also add that right on the dyno my modified stock iron intake made 6 more HP than an Edelbrock Performer RPM intake. A modified HO "re-pop" was 4 hp less than the RPM and it was also "modified" same as my iron intake. The test engine was a 440cid (428 based) with 260cfm KRE aluminum "D" ports, Oliver rods, Ross flat tops, 10.6 to 1 compression and custom ground HR cam with Comp XFI lobes (.361") sporting 236/242 @ .050" duration (topped with Crower Enduro 1.6 rockers). It made 497hp with the iron intake, 491hp with the RPM, and dropped to 487hp with the HO intake..........Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
The Following User Says Thank You to Cliff R For This Useful Post: | ||
#28
|
||||
|
||||
I run a Torker 2 on my 76 Trans am. I made a few adjustments and it fits pretty good.
__________________
68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick. Best so far 9.95@134 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
#29
|
||||
|
||||
Quote:
__________________
70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#30
|
||||
|
||||
Quote:
Here is a link to the system. https://www.holley.com/products/exha...er/parts/17149 It comes with 50 series mufflers, but you can ditch them for others if you want like I did. Hope it helps. Last edited by napster; 03-18-2022 at 12:04 PM. |
#31
|
||||
|
||||
Not going to make over 500 with 2.25" manifolds.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#32
|
||||
|
||||
I didn't know that the RA restorations manifolds were available in 2.5" size. They aren't available now, maybe June, according to them. So it seems like I would want a set of those plus a new 2.5" mandrel bent exhaust. Since I won't be able to get the manifolds in time, I'm just going to run it through what I have now and see how it feels. We're all talking about numbers here but I really don't care much about that. I'm not racing so I don't care about time slips and I won't compete with anyone on the highest Dyno numbers so none of that matters to me. I only care how it feels when I drive it. If it feels like it's choked out then I can always upgrade later. If it feels great and runs great, maybe I'll leave it.
__________________
70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#33
|
||||
|
||||
The 2.5s are the 2.25s just opened up at the opening. It does make the sealing lip a lot thinner I had some sealing issues ion the D port ones on my 81.
It will still have GOBS of TQ and HP even with the intake and exhaust.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#34
|
||||
|
||||
jhien,
Here are a few pixs. |
#35
|
||||
|
||||
Here are three more. There are more, but that can be done through email. Also, I don't have the bolts or clamps. Got lost in moves from storage facilties.
Last edited by napster; 03-18-2022 at 07:36 PM. |
#36
|
|||
|
|||
Quote:
I'm not sure what hp that equates to, especially the 116 mph pass. Dennis Last edited by SD455DJ; 03-20-2022 at 06:11 PM. |
The Following 2 Users Say Thank You to SD455DJ For This Useful Post: | ||
#37
|
||||
|
||||
Quote:
__________________
70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
#38
|
|||
|
|||
Quote:
Dennis |
#39
|
||||
|
||||
My iron headed and iron intake 455 made 491/570 trq with 1.75 headers and lost about 17hp with the 2.25 ra manifolds with mandrel 2.5 headpipes. I did try to massage the outlet size on the exhaust manifolds with a electric grinder some. I bought my aftermarket manifolds many years ago,even maybe when they were first introduced. I ground as much as I dared to but still not out to 2.45"
__________________
72 lemans,455 e-head, UD 255/263 solid flat,3.73 gears,,,10" 4400 converter,, 6.68 at 101.8 mph,,1.44 60 ft.2007 (cam 271/278 roller)9"CC.4.11gear 6.41 at 106.32 mph 1.42 60 ft.(2009) SOLD,SOLD 1970 GTO 455 4 speed #matching,, 3.31 posi.Stock manifolds. # 64 heads.A factory mint tuquoise ,69' judge stripe car. 8.64 @ 87.3 mph on slippery street tires.Bad 2.25 60ft.Owned since 86' |
#40
|
|||
|
|||
Quote:
Dennis |
Reply |
|
|