70 model 350-300hp, #186 closed chamber heads, flat top 4 valve relief pistons, Crane Energizer cam (.480 lift, 228 duration @.050), Performer RPM intake (for Spreadbore), 750cfm Edelbrock Quadrajet Carb, 1-5/8" headers, Mallory HEI dist., 2-1/4" pipes into turbo mufflers then 2-1/2" Flowmaster tailpipes.

Transmission is a 200R4 (86MCSS) with a stock D5 convertor, rearend is a 12 bolt 3.73 posi, turning 25560R15 tires (27" tall)

I'm just wondering if the engine combo will work with everything else. Car is just a cruiser & might see the strip once in awhile.

thanks in advance.

sounds great smile.gif

I like the engine combination, it should make good power for a driver. But I think the cam is just a step or so too big for a heavy car like yours with small motor and stock convertor. The low first gear in the 200 trans and the 3.73s will help take off, but I still think it will feel a little sluggish off the line. I would go with a 2600 stall or drop the cam size a notch.

I ran basically the same combination years ago in 2 different small block 350's. In one I ran the GM 327-350HP cam (222 @.050 Int/Exh x .447 lift. The cam had a real good lope at idle but pulled hard to 6000. The other motor has a GM 350-350HP cam. The single pattern 222-222 was great. Both cars had 3:73 gears. On a 350CI motor I would back the intake duration down to around 220-222*{max} @ .050. I an currently running 228* @ .050 in a 408 Big BLock. A 228* will sound really mean in a 350 but just doesn't have enough bottum end.

does anyone else have any input as what would be a good chioce for a cam for the above combo, i've got a 9.6:1 compression ratio.

Think these guys have your combo figured out very well. Don't want a big cam with that low of compression and heavy weight! Agree with cam in .450max range will actually give you better performance than overcamming! Goodluck with your combo! :cool:

I agree on the smaller cam.

With 9.6:1 compression the max duration that you should run is about 270 adv and 224 at .050

An even better choice would be something just a bit smaller like such as

Comp 268HE
268 218 454 110

Crane Energizer 272H10
272 216 454 110

with the 200r and 3.73s and short tires your starting line ratio(SLR) will be low enuff to pull with that cam. Going with a 268H or 270ish cam will be fine too.

I got my motor pulled this past weekend, here is what I found once it was tore down to the shortblock.

The speed-pro pistons (H345NCP30) are .035 in the hole, I had a fel-pro head gasket about .039 (.074 quench), what I think I will end up with is a .015 fel-pro head gasket (this will give me .050 quench). Anyother ideas to get this down closer to .040 without decking the block?

Running these numbers (4.030 (bore), 3.48 (stroke), 64 (cc), .015 (head gasket), 4.100 (head gasket bore) , .035 (piston-to-deck), 5 cc (flattop) on Pat Kelley's DCR calculator I get a SCR of 10.14.

With a Comp Cam HE268 (60* ABDC), I will have a DCR of 8.39, is this to much for the street?

With a 272 H10 Crane cam (65* ABDC) the DCR would be 8.09.

With a 278 H10 Crane cam (68* ABDC) the DCR would be 7.90.

I already have the HE268 Comp Cam, should I go with one of the Crane Cams now, if so which one would be best.

Thanks for everyones help.