1.7 RR worth it on stock engine?
- Thread starter Shirley
- Start date
rsw007
New Member
if you have over 100,000 miles you will need to replace the valve springs also, thats why i havent done it.
is it worth it? I have 133k miles, and a bcam on a stock motor (dont ask) i heard 1.7rr's would get me the lift of an fcam, is it worth getting the new springs and rockers? is it expensive? will i feel a difference? sry for questions and stolen thread
I think you need to upgrade those weak stock valve springs. 1.7 ratio is OK for street use if you are not going to a custom cam. Will give you a little more power at the top end and should not loose any on the bottom. It is not a big gain but worth it if you will eventually go with TB, Intake, pullies, and exhaust upgrades. Sort of a cheap way to gain a little more smog legal cam.
Pedestal mounts should be fine with a street motor with bolt ons.
Pedestal mounts should be fine with a street motor with bolt ons.
just4bob50
Active Member
my friend put 1.7's on his stock cam 110,000 mile motor and had valve float before he hit 5500 rpms with the stock springs. He pulled the 1.7's back off till he got his new heads.
Daniel50
New Member
Foxfan88 said:
very re-assuring lol
the 1.7 roller rockers will add .030 lift to your cam. some people get lift and duartation mixed up. upgraded valve spings is highly recomended. and if these are going on stock heads than pedestal mount is what you want. stud mount is for aftermareket heads. will you feel it? yes you might get a small sotp feel similiar to an underdrive pulley swap. imho wait for heads and a good aftermarket cam.
Unless you get a set of used RR's, your going to pay at least $230 minimal. (Crane 1.7's require longer pushrods, so you end up paying even more) So why not put that money towards something else. With stock E7's it won't make much difference because they don't flow any better past 440 lift anyways. I'd rather just get a cam like a TFS1 or other mild cam if you want more lift. Even then, with an intake that only flows 130cfm per runner, it just won't quite do what you want.
Take your $230-280 and spend it towards:
porting the lower intake, buying a used intake
gear
cam
better shifter/quadrant
well I could name other things too.
Stock valve springs can't hardly handle the stock cam, especially with some age to them. You can get a decent spring upgrade for around $100. I had the B-cam on 1.7's, .512 lift, thumper heads with the double springs, no valve float at rev limiter.
Take your $230-280 and spend it towards:
porting the lower intake, buying a used intake
gear
cam
better shifter/quadrant
well I could name other things too.
Stock valve springs can't hardly handle the stock cam, especially with some age to them. You can get a decent spring upgrade for around $100. I had the B-cam on 1.7's, .512 lift, thumper heads with the double springs, no valve float at rev limiter.
legalize420
Active Member
90mustangGT said:
quick question. i just swapped in an e cam and gt40s and im using stoc pr's and rockers. my 1.7's will be here soon. do i need longer pr's with an e cam?
legalize420
Active Member
legalize420gt95 said:
You shouldn't need different pushrods unless the 1.7's are the Cobra type "energizer" Crane units.
I had a 1989 stock gt, bone stock, 284,000 miles. took the heads off, ported/blended, new manley valves and valve train, 1.7s and a girdle. Threw a matched weiand xcelerator intake manifold and a holley 650dp with a holley blue pump and holley regulator. Full exhaust -- long tubes with x pipe and purple horney glassback mufflers into turn downs. Car made 344whp, 342wtq. For a CHEAP, i mean CHEAP upgrade -- this **** on a fuel injection setup. Go Figure. All together spent 275 dollars for the carb, pump, intake and rr's on ebay.. plus 40 bucks for a carb rebuild kit.
Pretty badass if you ask me..and for those who say you need new springs? Err -- car now has 294k on it.. and uhh no issues.. no oil consumption and 185psi on all 8 cylinders. so.. !?
Pretty badass if you ask me..and for those who say you need new springs? Err -- car now has 294k on it.. and uhh no issues.. no oil consumption and 185psi on all 8 cylinders. so.. !?
If you don't take the time to check for the proper pattern of the rocker on the valve stem face, it's all a shot in the dark. NO ONE can say what your combo will need.
People give out alot of misinformation about stock valve springs and cam. 1.7 rockers will work on a stock 5.0 motor 100%, doesn't matter if you have 200 miles or 200,000 miles on the motor.
I've dynoed my motor before and after, and 1.7 roller rockers on a stock 5.0 motor is a 5-6rwhp gain. Thats like 10-15hp at the crank give or take a few.
I've dynoed my motor before and after, and 1.7 roller rockers on a stock 5.0 motor is a 5-6rwhp gain. Thats like 10-15hp at the crank give or take a few.
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