Here is a link to the heads. I have the 77189's since they are the only option for hydraulic cams. I know I don't have the solid ones. It should be okay what do you think?
Bad news, but great at the same time!!!
- Thread starter 69Rcode_Mach1
- Start date
302 coupe
Founding Member
I dunno, edelbrock doesn't show any spring specs other than a diameter of 1.55". No rate, or max lift is listed. Maybe a call to edelbrocks tech line will help you out. The lunati cam you linked to earlier is a reduced base circle unit. If you go with the link bar lifters, just pretend you have a late model 5.0, the same selection of cams will work for you, as they have the same firing order and the regular base circle, plus a huge selection of lobe designs.
302 coupe
Founding Member
Oh yeah I will definitely get the new gear for the distributor. The lift limit on the heads is .650 I don't know what ramp rates are though, could you explain that a little to me and what the effects are?
Hmmmm now that so many more options have been opened up to me. I am between these two cams. What do you guys think?
http://store.summitracing.com/defau...4294924929+4294887637+4294887636&autoview=sku
Or the same as above except not a retrofit.
http://store.summitracing.com/defau...4294924929+4294887637+4294887636&autoview=sku
http://store.summitracing.com/defau...4294924929+4294887637+4294887636&autoview=sku
Or the same as above except not a retrofit.
http://store.summitracing.com/defau...4294924929+4294887637+4294887636&autoview=sku
302 coupe
Founding Member
you need to call edelbrock and find out what the spring pressures are. Ask for installed height, pressure when open at X lift, pressure when closed(on the seat), and coil bind (just to be sure). Once you have that info, it needs to meet or exceed the spring requirements listed for whatever cam you choose. Just because a spring can handle X lift on a flat tappet cam, doesn't mean it could handle the same lift on an aggressive roller cam. The lobes are much steeper and extra pressure is needed to keep the lifter on the cam at higher rpms.
Since the springs are rated good to 650 lift, and Edelbrock says they're good for solid flat and hydraulic roller cams, you should be in the clear if you're considering a cam in the 550 range. It would be wise to make sure though.
After looking at those cams you listed, it looks like you plan on spinning this engine pretty hard. Are you sure you don't want a solid roller? The hydro's will work, but solids are made to rev. Just FYI, if you do look at solid roller cams, you can subtract the lash from the total lift. For example, a cam has .600 lift with a 1.6 rocker, but needs .020 lash. In effect, the cam will have .580 lift. Then lets say you switch to a 1.7 rocker, that bumps you up to .616 on the same cam with the same .020 lash. Catch my drift? Whatever you do, don't overcam a street engine. With your combo, I would limit myself to .580 or less, with mid 240's as max dur at .050. Any bigger than that and it will be a slug unless your beating the crap out of it.
Since the springs are rated good to 650 lift, and Edelbrock says they're good for solid flat and hydraulic roller cams, you should be in the clear if you're considering a cam in the 550 range. It would be wise to make sure though.
After looking at those cams you listed, it looks like you plan on spinning this engine pretty hard. Are you sure you don't want a solid roller? The hydro's will work, but solids are made to rev. Just FYI, if you do look at solid roller cams, you can subtract the lash from the total lift. For example, a cam has .600 lift with a 1.6 rocker, but needs .020 lash. In effect, the cam will have .580 lift. Then lets say you switch to a 1.7 rocker, that bumps you up to .616 on the same cam with the same .020 lash. Catch my drift? Whatever you do, don't overcam a street engine. With your combo, I would limit myself to .580 or less, with mid 240's as max dur at .050. Any bigger than that and it will be a slug unless your beating the crap out of it.
Yep I will definitely make sure by checking with them, I have 1.7 rockers so lift will be around .6", better safe than sorry in these cases. Can you check the other cam that i put in my previous post and let me know if one or the other would be better suited to my combo with a Victor Jr. intake. I have heard a lot about the TFS cams but I have also heard good things about that Lunati Cam. Also is their a specific diameter distributor gear I need to get for my year(1974 351W), ford sells a steel one at .531" diameter shaft for the 5.0/5.8 which sound right to me, I think the 302's used a smaller one.
302 coupe
Founding Member
comp XE282HR would be my choice. The lift is a little high, but the duration will keep it happy on a street car, should balance nicely. Not sure on the distributor gear, you could measure it with some dial calipers. I know the oil pump shaft is smaller, but I think the actual dist shafts are the same diameter.
That cam doesn't seem to match up as well though. Ronstang produced over 400rwhp with that cam on 9:1 compression 351 with the same combo. The car is not a daily driver just a "spirited weekend cruiser". I will definitely be gearing the car for the new combo when done. I don't plan to take it over 7000rpms though. That would be my redline at the very most.
302 coupe
Founding Member
the other cams you listed were in the 3000-6800 range, the comp 282 http://store.summitracing.com/partdetail.asp?part=CCA-35-522-8 works best from 2600-6500 and should make alot more useable torque, while still pulling just as well up top. The XE282 has a pretty good track record, I think it would work well with your combo, but thats just my opinion. Ask 5 different people which cam to use and you'll get 5 different answers every time.
