307 Exhaust manifolds
#1
307 Exhaust manifolds
I know the 85s are the better of the 307, but how would that compare to a set of headers. Anyone have real numbers?
This is a stcok 350 in an 84 Cutlass.
Thanks.
sb
This is a stcok 350 in an 84 Cutlass.
Thanks.
sb
#3
Ok.
I have built LOTS of mopars. I've even built a few fords. I've had the opportunity to drive them back to back with manifolds and with headers. To be honest, every time I did the swap to headers, I felt like I spent a lot of $$$ and time (especially on the mopars they suck for putting in headers!!!!) for very little return. In fact, the last 5 Mopars I built I used the cast iron manifolds. These included 3 slant sixes, a 318 and a high compression 400.
If this in not the case with Oldsmobiles, I'll spend the $80 extra (and time?) to put headers on over the cost of the JY cast iron manifolds.
Talk me into it.
sb
I have built LOTS of mopars. I've even built a few fords. I've had the opportunity to drive them back to back with manifolds and with headers. To be honest, every time I did the swap to headers, I felt like I spent a lot of $$$ and time (especially on the mopars they suck for putting in headers!!!!) for very little return. In fact, the last 5 Mopars I built I used the cast iron manifolds. These included 3 slant sixes, a 318 and a high compression 400.
If this in not the case with Oldsmobiles, I'll spend the $80 extra (and time?) to put headers on over the cost of the JY cast iron manifolds.
Talk me into it.
sb
#4
What other modifications have you done to the engine? If you don't have an aftermarket intake manfiold, high quality SBO heads, an aftermarket cam, and good carburetor then headers would be a waste of money IMHO. Of course, if you want to do all of these mods to your SBO then headers are a good place to start. You will gain decent HP and have a difference in the exhaust tone.
#5
Good point Olds 64.
All those mopars listed in the earlier post had more into them than this 350 does...the slants all had oversize valves, significant porting, milled for high compression, Erson 270* cams and at least a stock 2bbl or holley 350, 2200 stall converter backed by a 3.55-4.10 gear. The 318 had oversize valves, bored .060 over, 214* @ .50 cam, high compression pistons, 625 cfm 4bbl, AM intake (single plane), 2500 stall convertor backed by a 3.55 gear. The 400 was milled .100 for compression, AM 4bbl intake (dual plane), mild after market cam (don't remember specs), backed by 3.21 gear.
The only aftermarket (high performance) parts on this olds build are: "high performance" distributor, 2500 stall converter, FANCY summit transmission (WAAAY more transmission than needed), and as soon as I get the exhaust put on, 3.42 gears in the rear end.
Otherwise it is completely stock short block with 5a heads, factory 4bbl intake, and stock replacement parts. Will I one day build a bigger & better motor? Maybe. The 403 I was looking at is GONE. So, for now, I will keep my rescued 350.
sb
All those mopars listed in the earlier post had more into them than this 350 does...the slants all had oversize valves, significant porting, milled for high compression, Erson 270* cams and at least a stock 2bbl or holley 350, 2200 stall converter backed by a 3.55-4.10 gear. The 318 had oversize valves, bored .060 over, 214* @ .50 cam, high compression pistons, 625 cfm 4bbl, AM intake (single plane), 2500 stall convertor backed by a 3.55 gear. The 400 was milled .100 for compression, AM 4bbl intake (dual plane), mild after market cam (don't remember specs), backed by 3.21 gear.
The only aftermarket (high performance) parts on this olds build are: "high performance" distributor, 2500 stall converter, FANCY summit transmission (WAAAY more transmission than needed), and as soon as I get the exhaust put on, 3.42 gears in the rear end.
Otherwise it is completely stock short block with 5a heads, factory 4bbl intake, and stock replacement parts. Will I one day build a bigger & better motor? Maybe. The 403 I was looking at is GONE. So, for now, I will keep my rescued 350.
sb
#11
Any ideas if these will fit my G-body cutlass?
https://classicoldsmobile.com/forums...ds-shield.html
Thanks.
sb
https://classicoldsmobile.com/forums...ds-shield.html
Thanks.
sb
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