I'm running the 274 with a 10:1 400 with E-heads, 1:5 HS rockers, stiff springs, Performer RPM intake, and Dougs 1 7/8 headers with 2-1/2 on out. TH400 with 2600 stall and 3:23s
While it'll rev to 6,500 easy, and lope pretty noticeably at idle, I can't help but feel there's power left on the table with the cam. I've not done a bunch of cross validation on different combos, but I truly expected more.
Admittedly, a tune would likely help (it's still got the break-in tune) so we'll see.
Peeling tires out of Dairy Queen is all I've been able to do so far, but I'll drag it next weekend and get some timeslips.
That said, with stock heads, I'd go with XE268, but I'd strongly suggest consulting a few different Pontiac builders, in addition to posting here, to get their thoughts as well.
My biggest regret is not going roller when I built the engine, so choose carefully my friend.
Cheers!
__________________
Dan
Austin, Texas
Antique Gold 1969 Pontiac GTO YS400/TH400 3:23 10-bolt
2009 Pontiac G8 GT Maverick silver/Black Interior
1997 Chevrolet S-10
|