hello everybody, i posted this combo a while back letting you guys know what im putting together, well its almost done,just waiting on a few other items. i should have it running by summer.maybe sooner but my wife and daughters come first.never know what to expect but anyway i just would like to get some comments from you guys on this. these are parts i already had so i am just going to run with what i got for right know.
here it is
454 bored .070 over
10.2.1 srp psitons hung on stock 3/8 rods with arp wave loc bolts
lunat cam# 502A4lun 287/295 256/264 @ .050 .660in
.660out 110lsa will be on a 106
3994026 ls6 rect. heads with 2.19in 1.88ex heads have been fully ported they were on my old 468 that turned a best of 10.39 @127mph but that was with a alot of compression and cam
1050 dominater mounted on weiand team g manifold
art carr 4500 stall
th-350
4.56 gears in the rear 28" tall tire
the best 60 foot time this car has had was 1.45 on stock rear suspension so it shouildnt have any problems hooking up at the track wont know till i go. i will keep you guys posted on the progress. thanks

i forgot to add the hooker super comp 2inch headers i also have running through a pair of 3" inch flowmaster mufflers.

Sounds STOUT! Have you calculated the trap rpms? It seems that 4.56s and a 28" slick are a bit much at the top end. Where did it cross the stripe, 7000 or more? This is an amatuer observation, but most rats repond well to a bit less gear like 4.33 - 4.10, although the 4.10 rats I'm aware of run a bit less cam.

427L88, i have been trying to find that formula for the trap rpms, had along time ago. i have it in my notes somewere, but i have stacks and stacks of notepads,magazines, and binders could take me a month to find. do you have that formula?

anybody else care to chime on this?

I presently running similar combo except with 13:1 comp. and bigger heads but with a Holley 950HP. I am running 456 on 29's at 68-7000 thru the traps. For my heavier car 456 is ok but I'm lightening the car and 411 if certainly a consideration when I get finished with my present .660 cam but eventually will go .700+ cam and them 456 would be perfect so I sit tight for now. What is percentage street/strip use. Alot of carb and low comp. for your combo slanted toward the strip huh?! What car and weight?

Here's some math:

rpms = (mph x gear ratio x 336)/tire diameter

mph = (rpms x tire diameter x 2.96)/(rear gear x 1,000)

These formulas presume no trans or converter slip.

Observe your actual mph through the traps, compare that with your theoretical no-slip rpms, the difference represents efficiency loss, or slip %.

Thomas

thanks for the math. anybody else have any comments on the combination? thanks

comment: ya shoulda bought better connecting rods. ;)

i ran a set stock 3/8 connecting rods with arp wave loc bolts on my old motor and they saw 7000 to 7400 rpm a bunch of times without failing. im just using what i have laying around in the garage.

thanks for the comments. i will let you guys know what it runs hopefully in the summertime.