300WHP Supernatural 3.XX Coming Soon! (Page 25/54)
jdv SEP 10, 03:27 PM
La fiera what timing chain are you running on that motor ? Real nice looking.
Blacktree SEP 10, 04:02 PM
IIRC it's the Cloyes double-roller. My engine has one too. It's good stuff.
pmbrunelle SEP 10, 10:00 PM
The stock silent chains I have seen all stretch out, even on low-miles engines.

I bought a Cloyes chain for my Fiero, and I was concerned that additional noise (vs. a silent chain) could cause the knock sensor to be falsely triggered.

Well, that didn't happen. I don't have have unwanted knock retard all the time for no reason, so the Cloyes chain seems OK in that respect.
La fiera SEP 10, 10:19 PM
JVD, like Blacktree and PMBrunnelle have testified I have a double roller chain. The stock chain at low miles WILL stretch specially if you have stronger spring pressures. The heavier the valvetrain the more stretch you will have and those stock valves are heavy. That's why this Supernatural 3.7 has super lightweight valvetrain.

[This message has been edited by La fiera (edited 09-10-2020).]

lou_dias SEP 11, 12:02 PM
Do you have a part # for it?
Blacktree SEP 11, 02:21 PM
Looks like it was discontinued.
La fiera SEP 11, 09:27 PM

quote
Originally posted by Blacktree:

Looks like it was discontinued.



It is, it took me while to get this one. You might find a NOS somewere. I don't remember the part number but search it in Summit or Jegs. Search if for a 2.8 not for a 3.4.
Once I take the 3.4 out I'll check the play, maybe I can re use it. I know that the stock chain was stretched A LOT in the 2.8 with only like 600 miles of hard pounding between dyno and the track.
If you can't get it them the other option you have is to lighten the valves as much as you can.

[This message has been edited by La fiera (edited 09-11-2020).]

jdv SEP 11, 09:37 PM
That's what i thought. It seems like I have one of the last ones new in box. Anyone remember how much they go for new? I found a stash of parts that I bought years ago when I cleaned out a storage unit.
La fiera SEP 11, 10:03 PM

quote
Originally posted by jdv:

That's what i thought. It seems like I have one of the last ones new in box. Anyone remember how much they go for new? I found a stash of parts that I bought years ago when I cleaned out a storage unit.



I think I paid $130 for mine. It's worth it.
La fiera SEP 11, 11:07 PM
These are the official iron heads flow numbers on these heads with the 3.7 Supernatural bore.

Intake:
.100= 62
.200= 121
.300= 163
.400= 188
.500= 195
.600= 201

Exhaust:
.100= 56
.200= 102
.300= 143
.400= 158
.500= 153
.600= 150

I published these numbers because for me these are only reference. They seem low right? If I change something in the package they will change for the good or for the bad.
I can make these bigger if I make the intake/valve combo more efficient. So, in other words these numbers are not concrete.
That's why some of you, specially the Third Gen crowd can't believe I made this much power with iron heads. All the aparatus above and below the heads/numbers are critical factors.