[ta man]

Originally Posted by 455TA

I had no idea that we are basically running the same shortblock. I have a 1970 455, factory crank, cast rods resized with arp bolts, and heavy TRW pistons. Are the valve angles similar on your heads compared to an 87cc E head? Ive been skeptical on going with more lift with mine due to PTV clearance but it sounds like I may be fine doing it. What mufflers are you running also? I have 3 inch flowmaster super 44's now with a 3 inch x pipe. Converter is about to happen once my car is dynoed.

I'm not sure on the valve angles..more lift is nice if the heads are set up for it.I'm in the .650 lift range.My mufflers are 2.5 inch Walker Dynomax Ultraflows with a 3 inch to 2.5 cone reducers.Even though they are 2.5 inch they are a really good flowing muffler.I will be eventually changing my exhaust..to either a full 3.5 to 3 inch tails...or putting my 2.5 inch tailpipes back on and running some cutouts up front for track days.

[455TA]

Originally Posted by ta man

I'm not sure on the valve angles..more lift is nice if the heads are set up for it.I'm in the .650 lift range.My mufflers are 2.5 inch Walker Dynomax Ultraflows with a 3 inch to 2.5 cone reducers.Even though they are 2.5 inch they are a really good flowing muffler.I will be eventually changing my exhaust..to either a full 3.5 to 3 inch tails...or putting my 2.5 inch tailpipes back on and running some cutouts up front for track days.

I may check ptv clearance and order some 1.65 rockers to increase my lift. I only have 520/540 lift now. I've been debating on taking my tailpipes off before the axle as well. I have 3.5 inch collectors into a 3 inch x pipe with 3 inch pipe all the way to the back. I have my performer rpm off now and I did a complete port job on it - still going to get a single plane to test back to back at the track next year once my converter is in.

[ta man]

Originally Posted by 455TA

I may check ptv clearance and order some 1.65 rockers to increase my lift. I only have 520/540 lift now. I've been debating on taking my tailpipes off before the axle as well. I have 3.5 inch collectors into a 3 inch x pipe with 3 inch pipe all the way to the back. I have my performer rpm off now and I did a complete port job on it - still going to get a single plane to test back to back at the track next year once my converter is in.

Your exhaust should be fine..Torquewar (Andy) runs the same as I do and his exhaust doesn't seem to pose a restriction.He has full 3 inch.My tailpipes were only 2.5 inches and even though they were mandrel bent did cause a restriction.On the other hand it is a cheap test to do!
Do you have flow sheets for your heads?

[455TA]

Originally Posted by ta man

Your exhaust should be fine..Torquewar (Andy) runs the same as I do and his exhaust doesn't seem to pose a restriction.He has full 3 inch.My tailpipes were only 2.5 inches and even though they were mandrel bent did cause a restriction.On the other hand it is a cheap test to do!
Do you have flow sheets for your heads?

Okay good deal. I do have some flow sheets. I will try to post them up once I find them in my phone. They flow around 290 cfm at 550 lift and 305 cfm at 700 lift. They just have the entrances opened up to a 2.3x1.2 port and blended in about two inches and the bowls have been cleaned up, and chambers polished. The runners havent had any porting done to them. I just bought a Northwind intake so I will be porting it out completely and matching it to my heads.

[ta man]

Weighed my car the other day came in at 3540lbs plus my 170 so race weight of 3710.My little weight losses have added up plus my old car at 3900lbs still had steel hood,snowflake rims and iron heads at the time.

[Steve C.]

Your HP is 575 computed from your vehicle weight of 3710 pounds and 123.6 MPH.

http://www.wallaceracing.com/et-hp-mph.php



.

[slowbird]

Originally Posted by ta man

Weighed my car the other day came in at 3540lbs plus my 170 so race weight of 3710.My little weight losses have added up plus my old car at 3900lbs still had steel hood,snowflake rims and iron heads at the time.

Cool, thanks for weighing it and sharing.

[ta man]

Damn Steve..my weather was way better than your signature DA!Maybe next year I can run in Texas weather and still get in the 10's!

[Michael G]

Originally Posted by ta man

Weighed my car the other day came in at 3540lbs plus my 170 so race weight of 3710.My little weight losses have added up plus my old car at 3900lbs still had steel hood,snowflake rims and iron heads at the time.

Thanks for weighing and sharing. Always nice to be able to compare apples to apples.

[ta man]

Originally Posted by Michael G

Thanks for weighing and sharing. Always nice to be able to compare apples to apples.

I agree for us tuners it gives us a good baseline with other combos that are similar.Most of us share everything which is good!

[TCSGTO]

Originally Posted by ta man

I'm not sure on the valve angles..more lift is nice if the heads are set up for it.I'm in the .650 lift range.My mufflers are 2.5 inch Walker Dynomax Ultraflows with a 3 inch to 2.5 cone reducers.Even though they are 2.5 inch they are a really good flowing muffler.I will be eventually changing my exhaust..to either a full 3.5 to 3 inch tails...or putting my 2.5 inch tailpipes back on and running some cutouts up front for track days.

I run those same mufflers and even though the bushings are 2.5 the core is 3". Seeing the improvement from removing the tailpipes on the TA I'm probably going to have the bushings bumped to 3" and run some 3" tailpipes.

[ta man]

Originally Posted by TCSGTO

I run those same mufflers and even though the bushings are 2.5 the core is 3". Seeing the improvement from removing the tailpipes on the TA I'm probably going to have the bushings bumped to 3" and run some 3" tailpipes.

Good plan..they do flow well!I've had these mufflers for years...they were first put on my old Trans Am when it was running 14's..just on a basic 455 build..by replacing the stock 2 1/4" inch tailpipes with 2.5 inch tailpipes and the Ultraflows..it picked up 3 tenths..They have to be 14 years old!

[77 TRASHCAN]

Originally Posted by ta man

I'm not sure on the valve angles..more lift is nice if the heads are set up for it.I'm in the .650 lift range.My mufflers are 2.5 inch Walker Dynomax Ultraflows with a 3 inch to 2.5 cone reducers.Even though they are 2.5 inch they are a really good flowing muffler.I will be eventually changing my exhaust..to either a full 3.5 to 3 inch tails...or putting my 2.5 inch tailpipes back on and running some cutouts up front for track days.

Cutouts would be convenient. You could add cutouts to your present system, possibly. The largest size cutouts I've seen are 3", are they large enough for your purpose?