[Lee]

Originally Posted by SD455DJ

Thanks everyone for your posts. I see now that it is an 'impossible-to-answer' question, just too many variables to consider to make any direct correlations to flywheel data.

Lee, you chassis dyno'd a low compression 455 as I recall...can you repost those? I'm not trying to compare the two 455's, just curious to see what yours did again. My 455HO was rebuilt back in 2005 when it was in the Chicago area and was then chassis dyno'd in 2010 when it was in the Toronto area before I bought it in 2015. It had a Comps Cams XE 276 (230/236/110) when dyno'd (since changed).

Dennis

Dennis, here are a few for you to compare with.

1. This is my own 455. Stock "66" casting heads, bevel-edged pistons, CR ~7.8, 222/242 HFT cam 116lsa, .443/.435. tri-Y headers, 3" exhaust, Performer intake, Q-jet, automatic with stock stall.

2. 400 with SD Performance ported 6X heads. CR ~ 8.3:1. 2.5" R/A manifolds, Performer intake, Q-jet, 4spd manual tranny. HR cam, 224/236, 115lsa, lift just under .540".

3. 455 built back in '03, using box-stock Edelbrock heads, pretty sure they were 85cc. Cam is a Crane HFT single pattern, 228/228, 112 lsa, lift was somewhere in the .530-.540" range with the rockers used. Stock intake with a Q-jet. Doug's headers and a good exhaust (don't remember specifics). Transmission was a switch-pitch THM 400, with the testing done with the converter in the tight position. Owner's desires were "run fine on pump gas, and I want it mild enough that my wife can take the kids to get ice cream in it." I talked to him a few years ago, and it was still running fine.