porting injector housings to 36MM

[HAWAIIZR-1]

Originally Posted by Polo-1

Hello

I tried to send you a pm on this 402. It might be my old 402. I have lost track of who owns it now. It went through a few hands.



Kevin

Wow! Talk about a blast from the past. It?s good to see you are still around Kevin!! [emoji1303]🤙🏼


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[wfot]

I cleaned out some old messages, please try again.
I got it from, Kris out of texas about 5 years ago..

[Polo-1]

Not sure who Kris is.

My story as I know it or remember it:

I built the 402 back in 2008-10. Heads were brand new, and porting by GVD. Cams from Pete, they are stage II Not Petes grind the old school stage II's.Had new GM lifters.The intake was built from Bill K. GVD had to fix the mess Bill made. Block was a 91 used has Ron Woods HD liners @ 4inch bore. JE pistons coated, top and sides plus other features. Rods are Crower. Crank is Moldex, nothing fancy will look like a factory crank with mallory in the rear ( I think). Bottom end is still on factory bolts ( 2-bolt main block .) Few other stuff.

I ran it for 20-40 miles. I screwed the drivers side intake cam timing. Nothing hurt just pissed me off. Then had to get a C6 Z06....

I sold it to Jim Donahue back in 2010-11? Jim had it till he died in 2016. Never installed it. David ( in MD) forgot his last name...
He called me and asked about it. I think he somehow got it from the Jims family. David sold it to someone and they were going to have a handbuilt sheet metal intake made for it? Something like that. I never heard anymore about it. Lost track of it.

All that I know for sure is it would kick the S#*@ out of Todd's motor 😝

I wish😀

[Polo-1]

Originally Posted by HAWAIIZR-1

Wow! Talk about a blast from the past. It?s good to see you are still around Kevin!! [emoji1303]🤙🏼


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Yeah still peek in once in a while. Can't get the old LT5 out of my blood. It's a bad boy for sure.

[tpepmeie]

Originally Posted by Polo-1

.



My story as I know it

I ran it for 20-40 miles..



All that I know for sure is it would kick the S#*@ out of Todd's motor [emoji13]



I wish[emoji3]

No way man. I went hundreds of miles, an dozens of dyno laps! Lol. Always good to hear from old timers, in forum years anyway!





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[Polo-1]

Good to hear you can still take a ribbing.

The 427 is a monster. You cracked 700 right? It's been a few years for me. Lost track on yours. I know it was out of my builds league!

[Paul Workman]

Originally Posted by wfot

I have spoken to Marc about this personally, a very nicely detailed runner will be about 45 HP over the 35HP posted on his site and yes, 10 less for the 93 - 95 versions.

I have been looking at the differences between the 375 vs 405 housings and finds that the secondary runners are very similar, however the primary runners on the 405hp have much more volume..measured in ML. secondaries are both 80 ML and the 375HP primary about 70ML and the 405HP primary is about 80ML. the 405HP runners seem to be much more equal in volume as far as primary vs secondary.

Pete seems to do more extensive work with a 37mm port and I would doubt that there is an honest 50HP hiding in those housings.... hence this tread...

John

In addition my using Pete's model runner size as my guide, and Pete later phased my cams slightly as well, the whp was 432.

I'll let you do the math, but the porting and headers and (stock cams) phasing resulted in a HUGE improvement in performance - significantly greater than a paltry 50 hp. So, what am I missing here???

My stock bottom, stock cammed LT5 before and after.